CN101647208B - Wireless transmission power control method and system - Google Patents
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- H—ELECTRICITY
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- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/241—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
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- H04W52/06—TPC algorithms
- H04W52/12—Outer and inner loops
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W52/14—Separate analysis of uplink or downlink
- H04W52/143—Downlink power control
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
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- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
- H04W52/343—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading taking into account loading or congestion level
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Abstract
A wireless communication system, for example UMTS, comprises at least one primary station (10) and a plurality of secondary stations (UE). The or each primary station has a transmitter for transmitting wireless signals on a downlink and each secondary station has a receiver (16) for receiving signals on the downlink and a transmitter signals on an uplink. In a normal, loaded condition a synchronisation channel (SCH) and a data channel (DPCH) are present on the downlink and closed power control is effected by measuring the ratio of signal to interference, hereinafter referred to as SIR, in a received downlink transmission, comparing the measured SIR with a target SIR and sending a power adjust indication (TPC) on the uplink to cause the primary station to adjust accordingly its transmitted power on the downlink. The secondary station monitors the downlink and, in response to detecting an unloaded cell condition, determines a target SIR offset and applies the target SIR offset to the target SIR to increase temporarily the target SIR to overcome interference due to the presence of the SCH on the downlink.
Description
Technical field
The present invention relates to a kind of wireless transmission power control method, wireless transmission power control system and be used in extension station in this system.Especially applicable but not unique the third generation wireless communication system (UMTS) or the 3GPP (the 3rd generation collaborative project) of being applied to of the present invention.
Background technology
In the UMTS standard, based on W-CDMA (W-code division multiple access) technology, the power of control down link and uplink dedicated physical channels (DPCH).Specifically, from the angle of subscriber equipment (UE), mean that the base station or the main website (BS) that form fixed network will require power more or less in order to reach the quality of service (QoS) of being determined by network itself.In the UMTS standard, control to measure this QoS according to packet error rate (BLER) and with reference to outer circulating power.In order to reach the QoS of expection, the algorithm that UE implements converts the BLER demand to target SIR (signal to noise ratio and interference ratio).This algorithm is called the target SIR algorithm often.The 3GPP standard criterion is not specified the method that this target SIR algorithm is limited.3GPP is after the restriction unit of staying of this algorithm and/or the manufacturer, in order to allow them that its oneself own definition is set.
Since variable communication environments, variable demand BLER and/or possible DPCH (DPCH) the reason such as reconfigure so that the change of target SIR becomes limiting the challenge of target SIR algorithm in communication process.In case as calculated this target SIR, this UE then compares this SIR that measures at a time slot according to the DPCH that received with this target SIR.If the SIR of this measurement is lower than this target SIR, then this UE will require larger power from BS.On the contrary, if the SIR of this measurement is higher than this target SIR, then UE will notify this BS to reduce its transmitted power.This processing procedure is called interior circulating power control.
Difference along with the algorithm of selecting for this target SIR will affect the performance of this receiver.Specifically, the requirement that exists in the UMTS standard is, specifies the maximum BLER of maximum power that UE can ask and permission and arrives the convergence time of desired quality and for the above-mentioned requirements of several propagation conditions.The operator also has themselves the criterion according to maximum downlink power.They very clearly each UE and benchmark UE relatively, and if UE be in and be less than or equal to the corresponding downlink power that offers benchmark UE and the quality that can not reach expectation then can be refused this UE.Therefore need a kind of efficient target SIR algorithm.
The known technology that is used for open Loop Power control in the third generation wireless communication system is disclosed in the following document: US20050243752A1, EP1067815A1, US20050099968A1, WO2005032011A1, US20050085255A1 and GB2408419A1.US20050243752A1 discloses a kind of target SIR, according to from cell load and threshold value relatively a screening proportionality factor obtaining regulate this target SIR.More particularly, when this cell load is high value, increase this target SIR.The disclosed content of EP1067815A1 is, if cell load greater than a threshold value, then increases a target SIR.US20050099968A1 shows, send the synchronous channel SCH of scrambling without chnnel coding ground, if and this synchronous channel SCH and Dedicated Control Channel DCCH are overlapping, then this synchronous channel SCH can be regarded as so that the interference source of the bad change of this Dedicated Control Channel DCCH.In order to address this problem, suggestion is arranged when this DCCH and SCH are overlapping, increase this target SIR.WO2005032011A1 discloses in Dedicated Physical Data Channel (DPDCH) and the field that sends by reverse DPDCH the technology that arranges according to the target SIR of frame error.US20050085255A1 discloses the technology that target SIR is arranged according to the information from some channels.GB2408419A1 discloses the technology that this target SIR is provided according to the type of service that provides.
The key takeaway relevant with arranging of this target SIR processing procedure is:
(1) in general, target SIR is the over a long time processing procedure that needs the decoding of a hundreds of data block, in order to good BLER statistics system value was arranged before changing this target SIR value.This target SIR value result is very stable in time.
(2) initial value of this target SIR also is key point.As seen two kinds of methods are arranged in the document.A kind of scheme is the SIR initial value that high value is set, and can both decode in order to guarantee propagation conditions in any case, and another program is that the initial value of SIR is set to average definite after the test case that standard is provided is analyzed.
These schemes that formerly propose are not all considered the open Loop Power control of honeycomb (unloadedcell) when condition is popular in unloading.The honeycomb condition of unloading is that the truth in this area reaches the normal conditions of between the operability test (IOT).The principal character of unloaded cell is: from other user's low interference, good lor/loc (in the band received signal power and around the ratio between other interference power of honeycomb), SCH (be used for the primary synchronization channel (PSCH) of slot timing and be used for the auxiliary synchronous raceway groove (SSCH) of frame synchronization) and the main control physical channel (PCCPCH) that shares.
Summary of the invention
The objective of the invention is to improve the open Loop Power control under the unloaded cell condition popularity.
According to an aspect of the present invention, a kind of Poewr control method in wireless communication system is provided, this wireless communication system comprises: main website and extension station, this main website has the device for transmitted signal on down link, and this extension station has at described down link and receives signal and the device of transmitted signal on up link; Wherein the method comprising the steps of: in stress state, synchronizing channel and data channel are provided, by measuring transmitted signal in the down link that receives and the ratio (calling SIR in the following text) of interference, SIR and the target SIR of this measurement are compared, and transmitted power is regulated indication on this up link, so that this main website correspondingly regulates its transmitted power on this down link, realize close-loop power control; Described method is characterised in that, this extension station monitors the down link that is used for the unloaded cell condition, and response detection that the unloaded cell condition is carried out, determine the target SIR skew, and this target SIR offset applications increased this target SIR to this target SIR so as to overcome since the SCH on this down link have a caused interference.
According to a second aspect of the invention, a kind of wireless communication system is provided, comprise: main website and extension station, this main website has for the device that transmits synchronizing channel (SCH) and data channel at down link, and this extension station has for receiving signal at this down link and the device of transmitted signal on up link; And device, be used for realizing close-loop power control by following operation: measure signal and the ratio (calling SIR in the following text) of interference, the SIR that will measure that sends at the down link that receives and target SIR compares and on this up link the transmitted power adjusting indicate so that this main website correspondingly regulates its transmitted power on down link; The characteristic of described system is, this extension station has the following device of function, be used for monitoring the down link that is used for the unloaded cell condition, and response is to the detection of unloaded cell condition, be used for determining the target SIR skew, and this target SIR offset applications increased this target SIR to this target SIR so as to overcome since this SCH on this down link have a caused interference.
According to a third aspect of the invention we, the extension station of a kind of use in wireless communication system is provided, this wireless communication system comprises: main website and extension station, this main website has for the device that transmits synchronizing channel (SCH) and data channel at down link, and this extension station has for receiving signal at this down link and the device of transmitted signal on up link, and the device that is used for realizing by following operation close-loop power control: measure at the signal of the down link transmission that receives and the ratio (calling SIR in the following text) of interference, SIR and the target SIR of this measurement are compared, and transmitted power is regulated indication on this up link, so that this main website correspondingly regulates its transmitted power on down link; Characteristic is, this extension station has for the device that monitors the down link that is used for the unloaded cell condition, and response is to the detection of unloaded cell condition, be used for determining the target SIR skew, and this target SIR offset applications increased this target SIR to this target SIR so as to overcome since this SCH on this down link have a caused interference.
The present invention is according to the understanding to this fact: above-mentioned key point (1) and (2) in unloaded cell are height correlations.See, even when propagation conditions is fine, when namely usually having insignificant interference from other user and low DPCH power, SCH also is the key factor that BLER degenerates.The reason that SCH plays this important function is, this SCH is not by chnnel coding (or scrambling).In this case, because SCH and special-purpose pilot tone may be by simultaneously transmissions in this time slot, so the SIR that is estimated according to the pilot tone of Dedicated Physical Control Channel (DPCCH) by known method does not always reflect this SCH impact of interference.In fact, the real quality of this DPCH is in fact than estimating the poor of indication by this.Because the quite high situation of this initial sir value may occur, and this SIR estimates to cause any data block of can't correctly decoding near this target SIR value, from above-mentioned key point (1) as seen, the real quality of this DPCH is in fact than being a problem by the fact of the difference of this estimation indication for the target SIR algorithm of prior art.The result is that prior art very far and not detects QoS apart from the QoS that requires.In fact, reach in target SIR before the value of the QoS that satisfies this requirement, will obtain hundreds of with decoded frame.
In the method according to the invention, if detect the unloaded cell condition, then determine the target SIR skew and use immediately this SIR to be offset to avoid data block to be decoded by poor quality.The value of this target SIR skew depends on several factors, for example common receiver performance and current goal sir value.
Description of drawings
To be described in more detail the present invention by the corresponding accompanying drawing of exemplary reference now, wherein:
The schematic diagram of Fig. 1 is the block diagram of common the third generation wireless communication system,
Fig. 2 shows the example for the frame format of down link DPCH,
Fig. 3 shows the example for the frame format of up link DPCH,
Fig. 4 shows the example of the position relationship of DPCH and SYN, and
Fig. 5 is and the flow chart of implementing according to an example of the inventive method.
Use identical reference symbol to indicate corresponding feature among the figure.
Embodiment
With reference to figure 1, the common the third generation wireless communication system that illustrates comprises: the fixed network by a plurality of main websites that geographically separate or base station 10 form only shows a base station 10 among the figure.Main website also can be called as Node B s.Main website 10 comprises radio receiving-transmitting unit, is used for communicating by antenna and a plurality of user equipment (UE), and certain user's equipment UE can be portable equipment, and other then can be fixed user equipment.Can be according to unifrequency spread-spectrum standard, for example W-CDMA standard traffic.Main website 10 comprises for to apply the equipment of close-loop power control at each UE of its overlay area.Required power controls to realize that the CDMA so that the identical power level of essence side by side receives from this UE sends, in order to avoid closely/far problem related with spread spectrum transmission, and also tackles the momentary fluctuation that is caused by multipath fading.In the operation close-loop power control, UE measures signal-to-noise and the interference ratio power (SIR) in receiving downlink signal, and the SIR of this measurement compared with a target SIR being arranged among this UE, and in the situation that the two is different, this UE implements transmission power control (TPC).In 3GPP, if this measurement be better than this target SIR, then send TPC bit=0 in this up link, so that this main website reduces its transmitted power.In addition, if should measure inferior to this target SIR, then send TPC bit=1 in this up link, so that this main website improves its transmitted power.
Get back to Fig. 1, this UE comprises the antenna 14 that is coupled to radio frequency unit 16.This radio frequency unit 16 has the output 18 and the input that is coupled to the output 20 of this modulator-demodulator 22 be used to the input of being coupled to modulator-demodulator 22.This UE also comprises channel coding-decoder 30, the output 26 and 28 that channel coding-decoder 30 has the input of the output 24 that is coupled to modulator-demodulator 22 and is coupled to the different inputs of this modulator-demodulator 22.
The output 18 of radio frequency unit 16 comprises DPCH, is used to the demodulation processor 32 in this modulator-demodulator 22.Demodulation processor 32 is conciliate extension process to orthogonal detection and is added to the DPCH that this has been received, so that this DPCH of demodulation.Receive sir measurement unit 34 and be coupled to demodulation processor 32, in order to measure noise and interference ratio, i.e. this measured SIR, and the result that will measure is provided to comparator 36, wherein with the SIR that measures with export 28 target SIR that are arranged in this comparator 36 by channel coding-decoder 30 via it and compare.Result relatively is provided to TPC bit generator 38, and as mentioned above, whether according to being necessary to notify main website 10 to improve or reduce its transmitted power, TPC bit generator 38 produces " 0 " or " 1 ".The TPC bit is provided to modulated processor 40, modulated processor 40 spread-spectrum modulation Dedicated Physical Data Channel DPDCH (DTCH, and after spread-spectrum modulation, apply DA conversion and quadrature modulation DCCH) and special used for physical control channel DPCCH (TFCI (transport-format combination indicator), TPC, PILOT, FBI (feedback indicator)).Then the processing of radio frequency unit 16 embodiment such as frequency translation and power amplification and so on sends to main website to the signal that produces from antenna 14.This main website demodulation TPC bit is also controlled this down link transmitted power according to " 0 ", " 1 " logic of TPC bit.
Because the variation in the variation of the distance of swimming speed in communication process and the communication environments related with the distance of swimming, it is not constant needing this SIR of acquisition desired qualities (packet error rate or BLER).In order to deal with these variations, observe this block error and implement control, if this measured value inferior to this target BLER then increase this target SIR, reduces this target SIR if this measured value is better than this target BLER.The change of controlling adaptively this target SIR is well-known both open loop through-put power control in order to realize the quality of this expectation.
Carrying out this open Loop Power control by channel coding-decoder 30 processes.Demodulation and the signal that is provided on the output 24 are carried out error correction decodings by decoding processor 42 in the demodulation processor 32 of modulator-demodulator 22, then are segmented into data block TrBk.Carrying out crc error by TrBk subsequently detects.Reception-BLER measuring unit 44 is measured this reception BLER according to the result of the error detection of each transmission block TrBk, and this reception BLER is provided to comparator 46.BLER and the target BLER of 46 pairs of receptions of comparator compare, if and should receive BLER greater than this target BLER, then come this modulator-demodulator 22 of instruction to improve this target SIR by exporting 28, if should receive BLER less than this target BLER, then reduce this target SIR.
In open Loop Power control was processed, UE mainly decided this target SIR by the BLER of this Dedicated Traffic Channel (DTCH).Therefore, have in the situation of continuous silence in the audio call therein, the BLER that has this DTCH is revealed as good and the lasting situation about reducing of this target SIR.If under these conditions Dedicated Control Channel (DCCH) is introduced this DPCH (DPCH), then transmitted power will be too low and so that UE can not receive this DCCH and may cut off communication.If there is disturbing wave to exist, it is especially remarkable that this trend becomes.Therefore need this target SIR of control, in order to keep sufficient quality to receive this DCCH.
For the purpose of integrality, with reference to Fig. 2 single DPCH frame structure in the down link is described.Fig. 2 (a) illustrates the single DPCH frame with 10msec duration.Fig. 2 (b) illustrates each frame and comprises 15 time slot S
0To S
14, each time slot durations 666.7 μ sec.Fig. 2 (c) illustrates this DPCH and comprises five fields 50 to 54, represents respectively data 1, TPC, TFCI, data 2 and pilot tone.
Fig. 3 (c) illustrates the composition of single uplink frame, comprises 15 time slots and has duration of 10 milliseconds.More particularly, this frame comprises: Dedicated Physical Data Channel DPDCH, only send the schematic diagram of Fig. 3 (a) of data and special used for physical control channel DPCCH, have for the schematic diagram that sends such as the accompanying drawing 3 (b) of the field of pilot tone, TPC, TFCI and FBI (feedback indicator).With reference to figure 1, encode processor 48 is provided in the channel coding-decoder 30 again, expands data on channel DPDCH, DPCCH with orthogonal code.These data are mapped on real axis (I) and the imaginary axis (Q axle), and by multiplexed.The amount of bits of each time slot of DPDCH changes according to character rate, but each DPCCH time slot be fixed at 10 bits, and character rate stuck-at-１ 5ksps.
Fig. 4 shows the position relationship between SYN and the DPCH.In Fig. 4 (a), SCH is the synchronizing channel for cell search, and PCCPCH is the main control physical channel that shares.The period of SCH+PCCPCH is a slot time (=667 μ sec), and shown in Fig. 4 (b), this slot time is identical with the slot time of DPCH DPCH.The DPCH that Fig. 4 (b) illustrates has the nil symbol skew about SCH+PCCPCH, and by representing that respectively data 1, TPC bit, TFCI bit, data 2 and pilot bits are formed.Fig. 4 (c) shows the situation that wherein DPCH has the symbol offset of τ DPCH.Obvious from Fig. 4 (a), the whole duration for this time slot does not send this SCH continuously, but only sends this SCH in 1/10 of this duration.Therefore, overlapping variation between SCH and the DPCH.In Fig. 4 (b), the field 50 of overlapping these data 1 of SCH, and in Fig. 4 (c), the field 53 of overlapping these data 2 of SCH.
Because SCH is not by scrambling, it shows as an important interference source of honeycomb.The existence of this interference and the load of honeycomb are irrelevant.When this honeycomb is loaded, because the caused interference of appearance of SCH seldom as seen, and there is no need to change algorithm and determine this target SIR value.
Following form has provided the example of main website 10 (Fig. 1) for the power setting of normal load honeycomb and unloaded cell.
| The normal load honeycomb | Unloaded cell | |
| CPICH Ec/Lor | -10dB | -2.5dB |
| SCH Ec/Lor | -12dB | -4.5dB |
| DPCH Ec/Lor | -18dB | -30dB |
| OCNS/Lor (from other users' interference) | -1dB | Can ignore |
Abbreviation Ec/lor in the above table is the ratio of pilot power and total channel power.It may be noted that from form in this unloaded cell, SCH has occupied the prior part of this received power lor, and this DPCH or even lower.But for this unloaded cell, the interference that is caused by SCH has larger impact.In the operation, the SIR that estimates in special-purpose DPCCH pilot signal does not always reflect this bad change.Reason is, this SIR that estimates according to the DPCCH pilot signal not always with this SCH time alignment.In the case, the bad change of the SCH relevant with SIR is sightless, and the result is determine in the prior art that the method for this target SIR is invalid, and in fact the real quality of this DPCH to be inferior to by the indicated quality of this SIR estimation.The situation that can occur is, this initial target sir value is the high value of appropriateness, and the result is, the sir value of estimation is close to this target SIR value but there is not data block correctly to be decoded.This means this target SIR value away from the sir value that can satisfy required QoS, and will consume the hundreds of frame for reaching this required QoS.
In order to overcome this problem, need the method according to this invention, can estimate this cell load, and response detects the unloaded cell condition, determine that target SIR is offset, and will use immediately the data block that this target SIR just is offset to avoid the data of being decoded by poor quality.Can estimate this cell load according to several modes.Each mode is all take the cochannel Interference Estimation as the basis.For example, this cochannel Interference Estimation can be the calculating of the power ratio between SCH power and the DPCH power, or about the Interference Estimation of common pilot channel (CPICH).The value of this target SIR skew depends on several factors, for example common receiver performance and current goal sir value.
If sequentially unload at this honeycomb of communication period, then the method according to this invention will guarantee not have the problem of convergence time in initial phase, and Fast Convergent is to this suitable target SIR.If along with current honeycomb is confirmed as being loaded or exists from the variation of the propagation conditions that is offloaded to loading, can use the outer circulating power control algolithm of any prior art.
Fig. 5 shows a flow chart, is used in UE embodiment such as the method according to this invention.The operation of frame 60 expression reception, demodulation and decode downlink signals.Frame 62 relates to the estimation that honeycomb is loaded or unloads.This can carry out in reception-BLER measuring unit 44 (Fig. 1).In decision box 64, check whether honeycomb is unloaded.If not (N) then processes with frame 66 and continues, and implements the open Loop Power control of prior art and processes, and wherein target SIR provided on online 68.This target SIR on online 68 is added to frame 70, and it relates to the realization close-loop power control.In frame 72, produce TPC, and this TPC is sent to main website 10 (Fig. 1).
If in frame 64, judge this honeycomb unloaded (Y), then implement the open Loop Power control of a correction and process.In frame 76, calculate the target SIR skew.In frame 78, transient state ground increases this target SIR by this target SIR skew is combined with current goal SIR.In frame 80, use the target SIR that this transient state increases by the line 82 of close-loop power control frame 72.
Word " " before a unit described in this specification and the claim is not got rid of and is had a plurality of such unit.In addition, word " comprises " other key element or the step outside not getting rid of existence has enumerated.
The use of any reference symbol in the bracket of claim will not be interpreted as the restriction to the scope of claim.
From the reading of disclosure file, other improvement is clearly to those skilled in the art.These modifications can comprise further feature, and these other feature is known in design, the manufacturing of wireless transmission power control system and parts part and in using, and therefore can use to replace feature or use at this and describe feature outside the content.
Claims (12)
1. Poewr control method in wireless communication system, described wireless communication system comprises main website (10) and extension station, described main website has the device for transmitted signal on down link, and described extension station has at described down link and receives signal and the device (16) of transmitted signal on up link; Wherein said method comprises step: in stress state, synchronizing channel and data channel are provided, ratio (SIR) by measuring the signal that in the down link that receives, sends and interference, will measured SIR and target SIR compares and on described up link the transmitted power adjusting indicate, so that described main website correspondingly regulates its transmitted power on described down link, realize close-loop power control; Described method is characterised in that, described extension station monitors the down link that is used for the unloaded cell condition, and response detection that the unloaded cell condition is carried out, determine the target SIR skew, and described target SIR offset applications increased described target SIR to described target SIR so as to overcome since the described synchronizing channel on described down link have a caused interference.
2. method as claimed in claim 1 is characterized in that, determines the value that target SIR is offset according to receiver performance and current goal sir value.
3. such as the method for claim 1 or 2, it is characterized in that, recently determine the load/unload of honeycomb by calculating power between described synchronizing channel and the described data channel.
4. such as the method for claim 1 or 2, it is characterized in that, determine the load/unload of honeycomb by the interference of estimation on common pilot channel.
5. wireless communication system, comprise main website (10) and extension station, described main website has for the device that transmits synchronizing channel and data channel at down link, and described extension station has for receiving signal at described down link and the device (16) of transmitted signal on up link; The device following with function, be used for realizing close-loop power control by following operation: measure the signal that sends at the down link that receives and interference ratio (SIR), with the SIR of described measurement with target SIR compares and on described up link the transmitted power adjusting indicate so that described main website correspondingly regulates its transmitted power on down link; The characteristic of described system is, described extension station has device, be used for monitoring the down link that is used for the unloaded cell condition, and response is to the detection of unloaded cell condition, be used for determining the target SIR skew, and described target SIR offset applications increased described target SIR to described target SIR so as to overcome since the described synchronizing channel on described down link have a caused interference.
6. the system of claim 5, characteristic be, is used for the device determined, determines the value that described target SIR is offset according to performance and the current goal sir value of the device that is used for receiving described down link signal.
7. claim 5 or 6 system, characteristic is, the cell load estimator has be used to the device of determining, recently determines the load/unload of honeycomb by calculating power between described synchronizing channel and the described data channel.
8. claim 5 or 6 system, characteristic is, the cell load estimator has be used to the device of determining, determines the load/unload of honeycomb by estimating interference on common pilot channel.
9. the extension station of use in wireless communication system, described wireless communication system comprises: main website (10) and extension station, described main website has for the device that transmits synchronizing channel and data channel at down link, and described extension station has for receiving signal at described down link and the device (16) of transmitted signal on up link; And the following device of function, be used for realizing close-loop power control by following operation: measure the signal that sends at the down link that receives and interference ratio (SIR), will measured SIR and target SIR compares and on described up link the transmitted power adjusting indicate so that described main website correspondingly regulates its transmitted power on down link; The characteristic of described extension station is, described extension station has device, be used for monitoring the down link that is used for the unloaded cell condition, and response is to the detection of unloaded cell condition, be used for determining the target SIR skew, and described target SIR offset applications increased described target SIR to described target SIR so as to overcome since the described synchronizing channel on described down link have a caused interference.
10. the extension station of claim 9, characteristic is, is used for the device determined, determines the value that described target SIR is offset according to performance and the current goal sir value of the device that is used for receiving described down link signal.
11. such as the extension station of claim 9 or 10, characteristic is, the cell load estimator has be used to the device of determining, recently determines the load/unload of honeycomb by calculating power between described synchronizing channel and the described data channel.
12. such as the extension station of claim 9 or 10, characteristic is, the cell load estimator has be used to the device of determining, determines the load/unload of honeycomb by the interference of estimation on common pilot channel.
Applications Claiming Priority (3)
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| EP07105142.9 | 2007-03-28 | ||
| EP07105142 | 2007-03-28 | ||
| PCT/IB2008/051019 WO2008117203A2 (en) | 2007-03-28 | 2008-03-18 | Wireless transmission power control method and system |
Publications (2)
| Publication Number | Publication Date |
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| CN101647208A CN101647208A (en) | 2010-02-10 |
| CN101647208B true CN101647208B (en) | 2013-01-30 |
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| CN2008800102900A Expired - Fee Related CN101647208B (en) | 2007-03-28 | 2008-03-18 | Wireless transmission power control method and system |
Country Status (5)
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| US (1) | US9161315B2 (en) |
| EP (1) | EP2143211B1 (en) |
| CN (1) | CN101647208B (en) |
| AT (1) | ATE532274T1 (en) |
| WO (1) | WO2008117203A2 (en) |
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| US7978621B2 (en) * | 2007-09-24 | 2011-07-12 | Broadcom Corporation | Power consumption management in a MIMO transceiver and method for use therewith |
| US8547913B2 (en) * | 2010-02-02 | 2013-10-01 | Apple Inc. | Apparatus and methods for signal reception based on network load estimations |
| US8204535B1 (en) * | 2010-03-16 | 2012-06-19 | Sprint Spectrum L.P. | Uniform reverse-link power control for an active set of a mobile station |
| CN102404829B (en) | 2011-12-07 | 2016-08-10 | 华为技术有限公司 | The method and device that power controls |
| CN103945353A (en) * | 2013-01-22 | 2014-07-23 | 华为技术有限公司 | Signaling method, user equipment and base station |
| KR102301840B1 (en) * | 2015-02-25 | 2021-09-14 | 삼성전자 주식회사 | Apparatus and method for controling transmission power of a terminal |
| US20190069251A1 (en) * | 2017-08-23 | 2019-02-28 | Mediatek Inc. | Zone-based power control methods and communications apparatus utilizing the same |
| US11356234B1 (en) * | 2020-01-28 | 2022-06-07 | T-Mobile Innovations Llc | Scheduling full-duplex transmissions in 5G networks |
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| WO2002082685A1 (en) * | 2001-04-06 | 2002-10-17 | Telefonaktiebolaget L M Ericsson (Publ) | Method and system of link control |
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- 2008-03-18 EP EP08719749A patent/EP2143211B1/en not_active Not-in-force
- 2008-03-18 WO PCT/IB2008/051019 patent/WO2008117203A2/en active Application Filing
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Also Published As
| Publication number | Publication date |
|---|---|
| US9161315B2 (en) | 2015-10-13 |
| EP2143211A2 (en) | 2010-01-13 |
| WO2008117203A2 (en) | 2008-10-02 |
| WO2008117203A3 (en) | 2009-02-19 |
| ATE532274T1 (en) | 2011-11-15 |
| CN101647208A (en) | 2010-02-10 |
| EP2143211B1 (en) | 2011-11-02 |
| US20100105407A1 (en) | 2010-04-29 |
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